1,703 research outputs found
On Neutrinos and Fermionic Mass Patterns
Recent data on neutrino mass differences are consistent with a hierarchical
neutrino mass structure strikingly similar to what is observed for the other
fermionic masses.Comment: 8pages, 2figure
Minimal archi-texture for neutrino mass matrices
The origin of the observed masses and mixing angles of quarks and leptons is
one of imperative subjects in and beyond the standard model. Toward a deeper
understanding of flavor structure, we investigate in this paper the minimality
of fermion mass (Yukawa) matrices in unified theory. That is, the simplest
matrix form is explored in light of the current experimental data for quarks
and leptons, including the recent measurements of quark CP violation and
neutrino oscillations. Two types of neutrino mass schemes are particularly
analyzed; (i) Majorana masses of left-handed neutrinos with unspecified
mechanism and (ii) Dirac and Majorana masses introducing three right-handed
neutrinos. As a result, new classes of neutrino mass matrices are found to be
consistent to the low-energy experimental data and high-energy unification
hypothesis. For distinctive phenomenological implications of the minimal
fermion mass textures, we discuss flavor-violating decay of charged leptons,
the baryon asymmetry of the universe via thermal leptogenesis, neutrino-less
double beta decay, and low-energy leptonic CP violation.Comment: 37 pages, 6 figure
Constructing Dirac linear fermions in terms of non-linear Heisenberg spinors
We show that the massive (or massless) neutrinos can be described as special
states of Heisenberg nonlinear spinors. As a by-product of this decomposition a
particularly attractive consequence appears: the possibility of relating the
existence of only three species of mass-less neutrinos to such internal
non-linear structure. At the same time it allows the possibility that neutrino
oscillation can occurs even for massless neutrinos
Hypercharge and baryon minus lepton number in E6
We study assignments of the hypercharge and baryon minus lepton number for
particles in the grand unification model. It is shown that there are
three assignments of hypercharge and three assignments of baryon minus lepton
number which are consistent with the Standard Model. Their explicit expressions
and detailed properties are given. In particular, we show that the
symmetry in cannot be orthogonal to the symmetry. Based on
these investigations, we propose an alternative SU(5) grand unification model.Comment: 16 pages, JHEP3.cls, To appear in JHE
XenITH: Xen in the Hand
Usability and portability have been key commercial drivers for increasingly capable handheld devices, which have been enabled by advances in Moore’s Law and well as in wireless systems. The nature of such devices makes them extremely personal, and yet they offer an untapped resource for new forms of peer-to-peer and cooperative communications relaying. Taking advantage of such capabilities requires concurrent resource control of the handheld’s computational and communications capacities. Virtualization platforms, such as the Xen system, have opened the possibility of multiplexing a handheld device in useful and unobtrusive ways, as personal applications can be used while additional services such as decentralized communications are also in operation. The purpose of this project is to experimentally demonstrate the ability of modern smartphone units to support a programmable network environment. We attempt to validate the system with a series of measurement experiments which demonstrate concurrent use of two operating systems, each using computational and network resources, in two virtual machines. Moreover, we demonstrate an acceptable level of user performance while maintaining a MANET using a programmable network router
Prediction of in Neutrino Mass Matrix with Two Zeros
We have discussed predictions of and in the framework of
the neutrino mass matrix with two zeros. In the case of the best fit values of
, , and , the prediction of is . The lower
bound of is 0.05, which depends on and
. We have investigated the stability of these predictions
taking account of small corrections to zeros, which may come from radiative
corrections or off-diagonal elements of the charged lepton massmatrix.
The lower bound of comes down considerably due to the small
corrections to zeros.Comment: Figures and discussions are adde
Neutrino mixing and CP violation from Dirac-Majorana bimaximal mixture and quark-lepton unification
We demonstrate that only two ansatz can produce the features of the neutrino
mixing angles. The first ansatz comes from the quark-lepton grand unification;
is satisfied for left-handed neutrinos, where
are the Dirac mass eigenstates and are the flavour
eigenstates. The second ansatz comes from the assumption; is satisfied between the Dirac mass eigenstates
and the light Majorana neutrino mass eigenstates , where
is the bimaximal mixing matrix. By these two ansatz, the
Maki-Nakagawa-Sakata matrix is given by . We find that in this model the novel relation is satisfied, where and are
solar and CHOOZ angle respectively. This "Solar-CHOOZ Complementarity" relation
indicates that only if the CHOOZ angle is sizable, the solar
angle can deviate from the maximal mixing. We also infer the CP
violation in neutrino oscillations. The leptonic Dirac CP phase
is predicted as , where are the CKM parameters in Wolfenstein parametrization. Furthermore, we
remark that the ratio of the Jarlskog CP violation factor for quarks and
leptons is important, because the large uncertainty on is cancelled out
in the ratio, .Comment: 9 pages, no figures; v2 references added, v3 references adde
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